Radio apparatus



AiigQB, 1932. w. L. CARLSON 1,871,405

RADIO APPARATUS Fil ed May 23, 1927 Inventor: We'ndeHL. Carlson,

His Attorney.

Patented Aug. 9, 1932 L GAWIIEQEID @725 mos Rocco My iovomiozo mimics-so scdio oppocoiaos, and has for its priocipsi object the provision of on improved ompiififyimg cod oicccch ing which may ho scoxiiiy omijoso ed to opomfos either with a high cicgrco fidoiiiy o o high dcgcco of sciocsiviiyq /Vhco. bsocdcost mo opcroccd f cqoctociss spaced; 19 kilocycios s difficuiiy'io opcm'cc socciviog opposotus high oooiiizy scicctivihy with out :ccvcrimg to sioglis hood ironsmois siozoo off course possiioic to opcmic such modo w i soicccivihy with cocoi? on the i1 inccioioisioo i scqucncicsu sicoi. ocss this; 3521s qooiity oi" so co ooioo oofizoincd. o fioiciifizy ac" fo -f lccoi rccsp'oion ooci wish omi high ssicccivi'zy oijustmcois for u rcccgotion iirough iotcsfcrcocca occo moo with my invention, sccciving oppororbos is ocsoo cd 15o scociiiy choogccl is m o, conciiizion oi ficisiicy with to bioc of o piui'o'ii'cy oi ofijccclmt fo qococy bonds or c'honocis to o condition oi ssisccivicy ioc distant rcccpbion thsoogh inhcsfcscocca v My involution wiiii ioc cifios understood from silo foiio'wiog cicscsioision when cos sidcssd connection Wiih the sccompooy=- ing drawing its scopc wili be poinccii. cos

in the sppcodlcoi cioizos,

Referring so the cirowiog, Fig. 1 iso wiring J diagram of a rociio sccciwing opporo'ms wherein my invention has been cmbociiezi; and Fig. 2 illustrates o coupiing ci'onsformcs construcceoi in occomisnco with my iovcnizioou The receiving opposoizos iiiustmtcoi by Fis", l compriscs on omcnoo 1 onci ciscciis 2 I "which one intcrconnccicd through c plurality of space iiischorgc deviccs compcisiog o of radio ircqucncy amplifiers 3 onci 4i cod. o hotcroxiytoc descctor 5 coupicfi to she comm ci'rcuii; of o iocoi oscillation generator 6. filo amplifies 3 is provided. with on input circuii; coupled. to tho antenna, 1 through c trons-V former 7 with on output circuit coupieoi no the input circuit of the amplifier through c transformer 8 omi with .ocondenser 9 for 5 neutralizing the capacity coupling between comic its comic soc-'1 gridi, The ompiificr is likefor osutroilizing this copociiyhcizwccn ifiss grid comic. coscicnsors 12 13 omi 14L conocccsd scsgocctivciy' in iopm; of ciao cicviccs 3 i and 5 cos omongcd to ioo odljososd by o siogic cosilaoi socmioor i5. order so snsorc coo propcs Eciocion hccwoco tho copsciziios of fliiicccsf; cussing coo. cicnsci's compensating condense? 16 omit if? are cosocc'izccl in oosoiioi wick ciao foaming coodcnssis 12 1 .30

Tho imosi ormocs 7 is provicioci pcimcsy winding 18 omomgcci co cooooccs to ground cithcr iiiroogi o. icoxi switch 21 or through isoci; 19 and swiocli 21 onci with o. scconcioz-y wimiiog comgtocisiog sections 22 cool 23 bcatwcso which imccposcii o scs itor Q4. Tho omfizpoi; ciccoit oz"; tho cosmos 5 is oscoogodi to Foo coopici 35o ciao ciscuii- '2 zhsoogii ocsosformcs 25 compri iog socooolory winding Q 5 pi'imory windings 2'3 oooi 28. A swifcchio dcvics 29 compsisicg movable cooisoci; mo ears 30 cool 31 is provicioqi for conizroiiisg tho connections of rosisfnoir QAL the primacy circuit", 2'? smilfsho primary circuit, 28 which is comocivcd in sscics with o. rcsiscor 33 As iodicocofl mom cicosiy inifiig. 5?, tbs scconoosy windings so osc ioosciy coupicdl to kilo psimosy Wing 5%? mod ciossiy coupicai to tho wind ing; 28.

Tho switch 29 is opcmioio to fizhrco diiiicscoc positions. Assuming this switch *zco Foo in ifss sight hood position, the rcsiscor 2 is shows ammo ciao winding 28 and scsistoc 33 cos open ciscuiizcd and the opposoms is hi'ghiy soicctivo but opom'ics with poor fidciity doc to ocionuooion of the iiighcr mociolsiaioo sieio hood frequencies. fi ieiisy of @hc op- Psrotus is grossly incrcoscfi by o csotmg tho swicco 29 co its iiiusimtcdi position cod com occiaiog tho Winding 2'? in series with tho Wimiing 28 and resistor 33. Opcmiion of the switch 29 to ics left hood posiclon removes tho short circuit from tho resistor 24 and in cicoscs to some extent the fidclifiy of the op porotus,

It will of course be understood that connecting the winding 28 in series with the winding 27 produces a closer coupling between the output circuit of the detector 5 and the circuit 2 and broadens the frequency range of the receiving apparatus, and that the effect of the'resistor 33 is to equalize the response at different frequencies within the range.

The embodiment of the invention illustrated and described herein has been selected for the purpose of clearly setting forth the principles involved. It will be apparent however that the invention is susceptible of being modified to meet the different conditions encountered in its use and I therefore aim to cover by the appended claims all modifications within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent oi the United States is:

1. The combination or" a space discharge device provided with an output circuit, a transformer comprising a secondary winding two primary windings respectively loosely and closely coupled to said secondary winding, switch means associated with said output circuit, said s'vitch means in one position t aid circuit through pace discharge s output circuit, a econdary winding and two primary gs respectively loosely and closely coupled to said secondary winding, resistance means, and switch means associated with said circuit, said switch means in one position thereoi completing said circuit through said loosely coupled winding and in another position completing said cireuit through both of said windings and said resistance means.

4. The combination ofa space discharge transrormer com.

device provided with an output circuit, a

transformer comprising a secondary winding and two primary windings respectively loosely andclosely coupled to said secondary winding, and switch means associated with said output circuit, said switch means in one position thereof completing said circuit through sald loosely coupled winding and in another position thereof connecting said pifh I and a detector, said amplifier heing provided lectivity and mary windings to said circuit in series with one another,

5. An apparatus comprising an amplifier and a detector each provided with input and output circuits, a resistor in'the input circuit of the amplifier and a coupling impedance in the output circuit of the detector for decreasing the selectivity and increasing the fidelity of the apparatus, and switch means associated with said input circ'uitot said amplifier and with said output circuit of said detector, said switch means being operable to remove said resistor from-the amplifier input circuit and said impedance from the detector output circuit, whereby said apparatus may be changed from a condition of high fidelity with decreased selectivity with regard to signals of a plurality of adjacent frequency bands or channels to a condition of high selectivity and decrease of fidelity with regard to distant reception through interference,

6. An apparatus comprising an amplifier and a detector provided with input and output circuits, a transformer comprising a sec-l ondary winding and primary windings re-' 9i) spectively loosely and closely coupled to said secondary winding, switch means associated with the output circuit of said detector, said switcn means in one position thereof connect, ing one of? said primary win l f j' circuit 1 p conn c in the H Sill ' omg i y winding prmiar ively loosely and closely c d :y windi switch me Mi output c1. 1 said itch means in position hereoi connectone of said print-try winnings in the outcircuit oi the detector in another position connecting all of said primary windings in "the output circuit of said detector, means for simultaneously tuning the input circuits of said amplifier and detector, and means connected to one of said input circuits for causing a predetermined relation to he maintained hetween the tuning of said input circuits.

8. An apparatus comprising an amplifier with atuned input circuit including a resistor and said detector being provided with.

an output circuit including a pair of primary windings and a resistor in series, said first named resistor and one of said primary windings being adapted to decrease the seincrease the fidelity of the apparatus, and switch means associated with said input circuit of said amplifier and with said output circuit of said detector, said said secondary winding,

switch means being operable to short circuit said first-named res stor and to open circuit said one of said primary WlIldlIlgS slmultaneously whereby the circuit constants'oitv said input circuit and of said output circuit may he changed simultaneously to change the operating characteristic of said apparatus from one of high fidelity to one of high selectivity. r

9. The combination of aspace discharge device provided with an output circuit, a transformer comprising a secondary winding and two primary windings respectively loosely and closely coupled to said secondary winding, and switch means associated with said output circuit, said switch means in one position thereof completing said circuit through said loosely coupled primary winding and in another position completing said circuit through both of said primary windmgs.

10. An apparatus comprising an amplifier and a detector provided with input and output circuits, a transformer comprising a secondary winding and two primary windings respectively loosely and closely coupled to switch means associated with said output circuit, said switch means in one position thereof completing said circuit through said loosely coupled primary winding and in another position completing said circuit through both of said primary windings, and means for simultaneously tuning the input circuits of said amplifier'and detector.

In witness whereof, I have hereunto set my hand this 21st day of May, 1927.

WENDELL L. CARLSON. 

